Fourth condition is that the Nabi must show clear signs and...

Fourth condition is that the Nabi must show clear signs and miracles to prove his claim. Continuity of Prophethood God, in His grace, never left mankind without a religious guide. That guide may be a prophet, a Rasul or an Imam. The first man, Prophet Adam, was made a vicegerent of Allah on this earth, so that he might lead his children on the right path. Since then, prophets and messengers were sent to all the regions and all the peoples.

Allah says in the Qur'an: Verily, though art a warner; and a guide for every nation.(Sura Saba, 34:28). In all, there came 124,000 prophets from God. Many of the prophets were sent to one or two villages, some even to one family or one man. Others were sent to a bigger area; still others to a whole tribe. But none of them, before our Holy Prophet, was sent to the whole mankind. Our Holy Prophet was sent to the whole mankind for up to the end of the world. No other prophet is to come after him.

He was, and is the Last Prophet. Evolution of Religious Guidance It appears from the history of divine religions that God sent from time to time many Shariah s (codes of law) which were suitable to that particular era. Prophet Nuh (a.s.) brought a Shariah which was simple to a great extent. And that Shariah was followed by other prophets up to the advent of Prophet Ibrahim (a.s.) Prophet Ibrahim (a.s.) was given a Shariah which was more elaborate and more comprehensive than the previous one.

The Shariah of Prophet Ibrahim remained in force for the children of Israel up to the time of Prophet Musa (a.s.) When Prophet Musa was given Torah (Law), it was a really comprehensive and fully detailed Shariah , which was followed by all the prophets of Bani Israel till Prophet Isa (a.s.) came. Prophet Isa (a.s) perfected the Shariah of Hadhrat Musa (a.s.) and made adjustments according to time. The Shariah of Prophet Isa (a.s.) remained valid till the arrival of the Holy Prophet of Islam.

Coming to the other branch of the family of Prophet Ibrahim (a.s.) we find that the children of Ismael were expected to follow the Shariah of Prophet Ibrahim (a.s.) up to the time of the Holy Prophet of Islam, Mustafa (s.a.w.). When he came he abrogated and cancelled all the previous Shariah s, and brought the final, most comprehensive and most suitable and moderate Shariah of all, which can meet the challenge of the changing times without any difficulty up to the Day of Judgment.

The prophets who brought new Shariah are called Ulul-Azm.